Liquid crystal display device and method for manufacturing LGP positioning block thereof

Abstract

A light guide plate (LGP) includes a positioning block that includes a positioning block body and a liquid filled and hermetically sealed in a receiving compartment formed in the interior of the positioning block body. The liquid is expandable with a drop of temperature so as to increase a volume thereof and thus enlarge a size of the positioning block body through elasticity of the positioning block body. In this way, the LGP positioning block is adjustable with the variation of the surrounding temperature so as to achieve effective positioning of the light guide plate and providing high reliability of a liquid crystal display device including the light guide plate.

What is claimed is: 
     
       1. A liquid crystal display device, comprising a backlight module, a mold frame arranged on the backlight module, a liquid crystal panel arranged on the mold frame, and a bezel arranged on the liquid crystal panel;
 wherein the backlight module comprises a backplane, a light-emitting diode (LED) light bar arranged in the backplane, a light guide plate (LPG) arranged in the backplane, an optic film assembly arranged on the light guide plate, and at least one positioning post and at least one LGP positioning block that positions the light guide plate; and 
 the at least one LGP positioning block comprises a positioning block body and a fluid hermetically sealed in an interior of the positioning block body and the positioning block body possesses elasticity; 
 wherein the fluid is expandable with a drop of temperature thereof to enlarge a size of the positioning block body through the elasticity of the positioning block body in order to compensate size reduction of the light guide plate caused by the temperature drop; and with an increase of temperature, the light guide plate is expanded by the temperature increase and the elasticity of the positioning block body absorbs the expansion of the light guide plate, and 
 wherein the positioning block body comprises a sealing trough formed by recessing a surface thereof, a passageway in communication with the sealing trough and extending into the interior of the positioning block body, and a receiving compartment in communication with the passageway and formed in the interior of the positioning block body; and the fluid is filled in the receiving compartment and the passageway and the sealing trough seals the fluid. 
 
     
     
       2. The liquid crystal display device as claimed in  claim 1 , wherein the backplane comprises a bottom board and a side board perpendicularly connected to the bottom board, the LED light bar being mounted to the side board, the light guide plate comprising a light-entrance side and a non-light-entrance side distant from the light-entrance side, a light emission surface of the LED light bar opposing the light-entrance side of the light guide plate; and
 the at least one positioning post is arranged at a location adjacent to the light-entrance side of the light guide plate to maintain a light coupling distance between the light guide plate and the LED light bar and the at least one LGP positioning block is arranged on the bottom board between the side board and the LGP non-light-entrance side. 
 
     
     
       3. The liquid crystal display device as claimed in  claim 2 , wherein the at least one positioning post comprises two positioning posts that are arranged adjacent to the light-entrance side of the light guide plate and are opposite to each other; and the at least one LGP positioning block comprises two LGP positioning blocks that are arranged opposite to each other and respectively set at corners of the LGP non-light-entrance side. 
     
     
       4. The liquid crystal display device as claimed in  claim 1 , wherein the sealing trough receives sealing adhesive filled therein and the sealing adhesive seals the fluid. 
     
     
       5. The liquid crystal display device as claimed in  claim 1 , wherein the fluid comprises a liquid. 
     
     
       6. The liquid crystal display device as claimed in  claim 5 , wherein the liquid comprises distilled water. 
     
     
       7. The liquid crystal display device as claimed in  claim 6 , wherein the liquid comprising distilled water freezes and expands in a temperature lower than zero degrees Celsius so as to enlarge a size of the positioning block body. 
     
     
       8. The liquid crystal display device as claimed in  claim 1 , wherein the positioning block body is made of rubber. 
     
     
       9. A liquid crystal display device, comprising:
 a light guide plate adapted to receive optical energy applied thereto so as to expand in size with an increase of temperature and to reduce the size with a drop of temperature; and 
 a positioning block that positions the light guide plate and comprises a positioning block body that possesses elasticity and comprises a receiving chamber formed in an interior of the positioning block body and a liquid hermetically sealed in the receiving chamber and having a volume defined by the receiving chamber; 
 wherein the volume of the liquid is expandable with the drop of temperature to enlarge a size of the positioning block body in order to compensate size reduction of the light guide plate; and with an increase of temperature, the light guide plate is expanded and the elasticity of the positioning block body absorbs the size expansion of the light guide plate, and 
 wherein the positioning block body comprises a sealing trough formed by recessing a surface thereof, a passageway in communication with the sealing trough and extending into the interior of the positioning block body and in communication with the receiving compartment; 
 and the liquid is filled in the receiving compartment and the passageway and the sealing trough seals the liquid. 
 
     
     
       10. The liquid crystal display device as claimed in  claim 9 , wherein the sealing trough receives sealing adhesive filled therein and the sealing adhesive seals the liquid. 
     
     
       11. The liquid crystal display device as claimed in  claim 9 , wherein the liquid comprises distilled water. 
     
     
       12. The liquid crystal display device as claimed in  claim 11 , wherein the liquid comprising distilled water freezes and expands in a temperature lower than zero degrees Celsius so as to enlarge the size of the positioning block body. 
     
     
       13. The liquid crystal display device as claimed in  claim 9 , wherein the positioning block body is made of rubber.